Machine



A. C. JACOBSON SAWING MACHINE Nov. 16,1926. Re, 16,478

Original Filed NOV. 2, 1922 3, Sheets-Sheet 1 INVENTOR.

ATT RNEYS.

Nov. 16,1926. Re, 16,478 I A. c. JACQBSON JISAWING MACHINE Original F l d N 2. 1922 3 Sheets-Sheet 2 IN VEN TOR.

By 01w 5.

Nov. 16 1926.

A. C. JACOBSON SAWING MACHINE 1922 3 Sheets-Sheet 5' Original Filed NOV, 2,

INVEVTOR. W 6. BY my ATT RNEYS.

Reissued Nov. 16, 1925,

UNITED STATES Re. 16,478 PATENT OFFICE.

AXCEL C. JACOBSON, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO MONARCH ELEC TRIO SAW COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION;

SAWING MACHINE.

Original No. 1,488,678, dated April 1, 1924, Serial No. 598,576, filed November 2, 1922. Application for reissue filed January 18,

The hereinafter described invention relates to that class of sawing mechanism wherein a circular saw is rotated in adjustably suspended condition to conveniently contact the object to be sawed, being of the type upon which United States Letters Pat ent No. 1,312,96 of August 12, 1919, entitled Sawing machine was granted to Fred M. Easton. The primary 0 ject of the present invention is to provide a sawing mechanism of this typeembodying improvements rendering the mechanism more eflicient and convenient in operation and of less danger to the operator.

In my improved machine, the saw is so mounted on a pivoted arm as to be freely movable fore and aft, laterally and vertically, and among the objects of the present I invention is. to-' so counter-balance the arm that the saw canbe held and guided by the operator with the least possible efiort and the armeasily and quickly moved in a manner raising the saw to a remote retired position out of danger to the operator and held in such position.

Another object of my invention is the provision of improved controlling means so combined With the mechanism that the power to drive the saw is automatically disconnected when the saw moves to the said retired position .and is automatically connected to drive the saw when the saw is moved therefrom toward the working position. By means 'ofthis automatic control, the saw has gained-the necessary momentum orspeed to assure expeditiousv and efiicientv cutting by the time it is brought against the work.- .Difiiculty has heretofore been encountered in this respect in manually controlled saws of the type shown in the saidv Easton patent, since the operator frequently failsto start the saw in time.

Another object of the invention is to provide an electrical mechanism operable through the pivotal saw. supporting lever arm for automatically controlling the oper'v ation of the electric motor used in driving the saw so that when the pivotal arm is confined against movement the electrical circuit tothe motor will be closed, thereby 'eifectingsimple and eflicient mechanism and control for the-operator, and. eliminating the necessity of having to carry the electrical connections on to the pivotal arm in oper 1926. Serial No. 82,124.

ating the switch thereon to start the saw in motion as heretofore.

Another object of the invention is to provide latch means for holding the saw-carry ing arm in the said retired position and cooperating means operable from a point adjacent the handle on the arm, and preferably connected to the handle itself, for releasing the latch to permit moving the saw to working position.

A further object of the invention is to improve the mounting of the saw carrying carriage by providing the carriage with grooved rollers co-operating' with a horizontal track round in cross section, such construction permitting free rolling movement of the carriage along the track and free transverse swinging movement thereon.

In the accompanying drawings I have illustrated certain specific embodiments of my invention, but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of the invention, the claims appended hereto being relied upon for that purpose.

Referring to the figures of the drawing Fig. 1 is a side elevation of the fully assembled mechanism with the pivotal arm confined out of movement in which position the electric current is disconnected and the saw is at rest.

Fig. 2 is likewise a side elevation of the complete assembly in which position the saw is running, the electrical connection for starting being made immediately upon disconnecting the pivotal lever arm from the latch as shown.

Fig. 3 is an enlarged side elevation partly I down to show the complete housing of the transmission carried by same.

Fig. 5 is an enlarged sectional view ofth'e transmission shown as a bevel gear drive fully encased or housed.

Fig. 6 is a completely assembled view showing the machine as mounted in practical operation, the pivotal arm being down and the saw running.

Referring to the drawings, numeral 10 designates the pivotal saw carrying member rotatable on the shaft 11, the latter being journailed at the end of a yoke or member 12. This yoke is supported on a pair of grooved rollers 12" travelling on a round track 12*. The lower end of yoke 12 is provided with a notched quadrant 13 while bracketed to its opposite end is electricmotor 14. My invention contemplates the pivotal mounting of the saw-carrying member 10 to move to and between a retired position (Fig. 1) and a working position (Fig. 2)

and means for holding the member in thretired position. As one convenient means which may be used for holding the member in this position, I illustrate herein a latch hereinafter described.

Releasably confined to the pivotal member 10, through engagement with the. notch 15 of quadrant 13, is rod or pin 16 constructed in the present instance to be lifted out of engagement therewith by rotar movement of the handle 17 to which the rod 16 is attached through a crank pin 18. Upon disengagement of the rod 16 from the notch 15 the pivotal member 10 is free to move on shaft 11 at the will of ti eoperator. Located closely adjacent quadrant 13 is switch 19 with electrical connections leading to motor 14. Switch 19 is provided with a push button 20 against which spring 21 is caused to bear so that a closed circuit is normally made through switch 19 to motor 14.

Pivotal member 10 is so arranged in relation to push. button 20 that upon enga 'cment of the rod 16 in notch 15 it is brou ht to bear against push button 20 pushing the sameback against the spring 21 and opening the electric circuit through the switch 19, thereby shutting oil the motor 14. A hand switch 22 is also provided for opening and closing the electric circuit from the power source but the control of the motor 14 in the operation of the saw is ordinarily automatically effected entirely through switch 19.

The shaft 11 which serves as a pivotal bearing for the member 10, is rotated by motor 14 through belt drive 23, although any equivalent drive may be used. Atlixed to shaft 11 is bevel gear 24 and meshed therewith is bevel gear 25. To the end of bevel gear 25 is secured an extended shaft 26 and to the opposite end of shaft 26 is affixed bevel gear 27. Meshing with bevel gear 27 is bevel gear 28 carried by shaft 29.

the latter being journalled in the end of pivotal member 10, and secured directly on shaft 29 is saw 30. The housing 31 completely encases the bevel gears 24 and 25 on shaft 11 while the housing 32 entirely encloses the bevel gears 2? and 28. The extended shaft 26 between the bevel gears is fully enclosed in housing which also serves as a bearing for same. in counterweight 34 is secured to the end of member 10 beyond the pivotal shaft 11 so as to cilitate the movement of the saw in operation without undue exertion on the part of the operator and to render the movement of the saw to the remote. and inoperative position an easy and quick operation.

The device completely assembled is mountie as shown in Fig. 6,

ed on a supporting f M which in the present instance is made of shafting with flang d floor supports, although angle iron or structural shapes may be used equally satisfactory as a supporting frame upon which the saw may travel. It will also be noted that the push button switch 19 is securely bracketed to the yoke 12 and the electrical wires leading into the switch are covered with a helical wire spring to protect them. Vvhen the switch is opened and the motor 14 is stopped, the member 10 is held in. fixed position by the end of rod 16 engaging in the notch 15, as shown in dotted lines, Fig. 3.

The operation of my improved sawing machine is believed to be obvious. Normally the device is in the inoperative posiion shown in Fig. 1. In this position the member 10 engages against the push button 20 and hoids the switch 19 in the open position.

The saw can be brought down to the working position by releasing the latch, this releasing means being operable from a point adjacent the handle 17 and pr ferably connected to the handle its-elf as illustrated.

hen the latch is "released and the saw brought toward the working position shown in F 2, the spring 21 closes the switch and starts the motor. By the time the saw reaches the work the motor has attained sutficient speed toe'lliciently perform the cutting operations. It will be obvious that in. the sawing operations the yoke 12 is free to travel along the track 12* and the provision. of the grooved rollers engaging the round track permits free rocking movement of the yoke on the track.

T he swingablc mounting of the yoke on the track permits fore and aft horizontal movement of the saw, the pivotal movement of the arm at 11. per nits vertical movement of the saw, and the said travelling movement on the track permits lateral movement of the saw. In this manner the saw is mov-' able to any working position desired.

The counter-balancing of the arm member 10 provides for the holding and guiding of the saw by the operator with'the least possible effort, thereby rendering the machine more efficient and convenient in operation.

Furthermore, this counter-balancing of the arm 'rendersthe moving of the saw to the retired position shown in Fig. 1 a very easy what'I claim and desire to secure by Letters Patent is:

1. Asawing machine comprising the combination of a pivotally mounted frame, a saw mounted thereon for swinging movement therewith to operative and inoperative positions, an electric motor, an operative driving connection from the motor to the saw, a normally closed switch for controlling the motor, and means carried by the frame and adapted to engage and hold the switch open when the frame is in the fully retired position.

2. A sawing machine comprising the combination of a supporting frame, an arm pivotally mounted therein'for movement in a vertical plane, a saw carried by the arm at one side of the pivotal mounting, the pivotal mounting of the arm permitting the saw to be raised to a remote retired position and lowered to the working position, an electric motor, an operative driving connection from the motor to the saw, a switch carried by the frame, and means carried by the arm and co-operating with the switch in a manner causing the switch to open when the arm pivots to bring the saw to the retired position and to close when the arm is moved therefrom toward the working position.

3. A sawing machine comprising the com bination of a supporting frame, an arm pivotally mounted thereon for movement in avertical plane, a saw carried by the arm at one side of the pivot-a1 mounting, the pivotal mounting of the arm permitting the saw to be raised to a remote retired position and lowered to the working position, a handle on the arm adjacent the saw, a power driving connection to the saw, co-operating latch means carried by the arm and frame for holding the arm in the retired position, and means operable from a point adjacent the handle for releasing the latch.

4. A sawing machine comprising the combination of a horizontal track, a downwardly extending yoke supported thereon for travelling movement along the track and for transverse swinging movement about the longitudinal axis thereof, an arm pivotally mounted on the lower end of the yoke for movement in a vertical plane, acircular saw at. one end of the arm at one side of the yoke, the arm being pivotally movable to raise the saw to aremote retired position out of danger to the operator, counterbalancing means acting on the arm in a direction to raise the saw to its retired position, and power driving connections to the saw, the mounting of the yoke for swinging movem'ent about the track axis permitting horizontal movement of the saw, the pivoted arm permitting vertical movement thereof, and the said travelling movement permitting lateral movement of the saw.

5. A sawing machine comprising the combination of a horizontal track, a downwardly extending yoke supported thereon for travelling movement along the track and for transverse swinging movement about the longitudinal axisthercof, an armpivotally mounted on the lower end of the yoke for movement in a vertical plane, a circular saw at one end of the arm at one side of the yoke, the arm being pivotally movable to raise the saw to a remote retired position out'of danger to the operator, counterbalancing means on the arm at the other side of the yoke and acting on the arm in a direction to raise the saw to its retired position, and power driving connections to the saw, the mounting of the yoke for swinging movement about the track axis permitting horizontal movement of the saw, the pivoted arm permitting vertical movement thereof, and the said travelling movement permitting lateral movement of the saw. v

'6. A sawing machine comprising the combination of a horizontal track, a downwardly extending yoke supported thereon. for travelling movement along the track and for transverse swinging movement about the longitudinal axis thereof, an arm pivotally mounted on the lower end of the yoke for movement in a vertical plane, a circular saw at one end of the arm at one side of the yoke, the arm being pivotally movableto raise the saw to a remote retired position out of danger to the operator, means acting on the arm in a direction to raise the saw to and hold the arm in such posit-ion, and power driving connections to the saw, the mounting of the yoke for swinging movement about the track axis permitting horizontal movement of the saw, the pivoted arm permitting vertical movement thereof, and the said travelling movement permitting lateral movement of the saw.

7. A sawing machine comprising the combination of a horizontal track, a downwardly extending yoke supported thereon for travelling movement along the track and for transverse swinging movement about the longitudinal axis thereof, an arm pivotally mounted, on the lower end of the yoke for movement in a vertical plane to and between a workmg position and a retired position, a.

circular saw at one end of the arm at one side of the yoke, counterbalancing means acting on the arm in a direction to raise the saw to its retired position, power driving connections to the saw, and means, including an electric switch automatically controlled zontal track substantially round in crosssection, a carriage having grooved supportmg rollers mounted on the track for travel lengthwise of and transverse roekingmovem ent on the track, a frame member supported on anc depending from the carr1age,-an

arm pivotally connected to the lower end of the frame member for movement in a. vertical plane, a circular saw on the outer end of the arm, driving connections to the saw, a handle on the arm adjacent the saw whereby the operator may rock the carriage to permit fore and aft movement of the saw and advance the carriage along the track to n ve the saw laterally, and may also raise and lower the saw through pivotal movement of the arm, the arm being pivotally movable to raise the saw to a remote retired position out of danger to the operator, and counterbalancing means acting on the arm in a direction to raise the saw to the said remote retired position.

AXOEL O. JAOOBSON. 

